Manhole-cover.



H. JONES.-

MANHOLE covm. APPLICATION IIVLBDMAB.. 9, 1911.

` Patented Dec. 12,1911.

coLUMnIA PLANOGRAPII C0., WASHINGTON UNITED STATES PATENT OFFICE.

HARRY JONES, OE sUEEERN, NEW YORK, AssreNoR To EDWARD H. EALLows, 0ENEWA YORK, N. Y.

MANHOLE-COVER.

Speccation Of Letters Patent.

Patented Dec. 12, 1911.

Application filed March 9, 1911. Serial No. 613,214.

To all whom 'it may concern:

Be it known that I, HARRY JONES, a citizen of the United States, and aresident of Suffern, in the county of Rockland and State of New York,have made and invented certain new and useful Improvements inManhole-Covers, of which the following is a specification.

My invent-ion relates to manhole covers for closing the manholes ofsewers, vaults, conduits, etc., the cover forming a part of the surface4of the street or pavement beneath which the sewer, vault, or conduit islocated; and the object thereof is to provide a manhole cover which maybe easily and cheaply manufactured; which Ywill be of great strength ascompared with the weight of material in it, and which will have asurface of the salne character as the surface of the street in which itis placed; and to provide such Otherjimprovements in and relating tomanhole covers as are hereinafter disclosed.

With the Objects above enumerated in view, my invention consists in theimproved manhole cover illustrated in the accompanying' drawing andhereinafter described and claimed, and in such modifications thereof aswill be obvious to those skilled in the art to which my inventionrelates.

In the accompanying drawing; Figure 1 is a view showing my improvedmanhole cover in plan; Fig. 2 is a view showing a section upon a planeindicated by the line 2 2, Fig. l; Fig. 3 is a View showing a slightlymodified form of my invention in plan 5 Fig. 4 is a view showingasection upon a plane indicated by the line 4-4, Fig. 3; and, Fig. 5 isa view showing a section upon a plane indicated by the line 5-5, Fig. 4.

Referring to the drawing, 6 represents a plurality of similar segmentsfrom which my manhole cover is formed. The number of segments employedmay be varied, but I prefer to employ four as shown, the separatesegments being made from wrought iron or steel plates cut in proper formand flanged at the periphery as shown, whereby the segments assume arecessed or dish like form. The plates from which the segments areformed are commonly Hanged by means of dies in a hydraulic or other formof press, the segments being thus of pressed steel construction as thatterm is commonly used.

The form of the several segments 6, is

shown in the drawing to be such that the manhole cover formed bysecuring the segments together, as by means of the rivets 7, is square,although other shapes of cover may be produced by employing segments ofother form. A filling piece 8 formed preferably from cast metal isprovided at the in-` ner ends of the segments 6 and secured in place bymeans of rivets or other securing means 9.

The segments 6 are arranged so as to open upward, and they are filledwith a self hardening fluid or plastic material such as concrete, asshown at 10, from which it will be seen that practically the entireupper surface of the manhole cover is of the same general character, andmay be of the identical material as the surface of the street in whichthe cover is Placed.

In Fig. 3 I have shown a manhole cover in which the segments 11 areseparated slightly along their adjacent meeting edges by means ofspacing blocks 12, whereby openings 13 are provided for the purpose ofVentilating the space beneath the cover. 'The segments 11 are securedltogether by means of rivets or equivalent fastening means 14 which passthrough the spacing blocks 12, and the inner ends of the segments aresecured to a filling piece 15 as above explained. The spacing blocks 12are preferably made tapering as shown in Fig. 4, and a filling ofconcrete or similar material 15 is employed as hereinbefore explained.

The manhole cover thus formed may be easily and cheaply constructed inlarge sizes, and is much lighter than a cast iron cover; and therecessed segments with a filling of self hardening materials result in acover, the surface of which is of the same character as the surface ofthe street in which thek cover is placed.

Having thus described my invention, I claim and desire to secure byLetters Patent:

1. A manhole cover comprising a plurality of recessed segments securedtogether to thereby form a single unitary structure, the recesses ofsaid segments being filled with a self-hardening material; and spacingblocks interposed between adjacent edges of said segments wherebyVentilating openings are formed.

2. A manhole cover comprising a plurality of recessed segments securedtogether to thereby form a single unitary structure, the

recesses of said segments being filled with land and Stale of New York,this 27th day n Self-hzudenng material; tapering spacing oi" l`ebruz1ry, 1L D. 1911. blocks interposed between ndjzlcent edges-0fHARRY JONES- sand segments; and a lllng plece at J[he 1nner ends'of saidsegments and to which said inner ends are secured.

Signed at Suffern, in the county of Rocktnesses EUGENE M. GREEN, C. C.MORGAN.

Copies of this patent may be obtained fol` ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

